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Models / OpenAI

GPT-5.6 Terra

GPT-5.6 · Released 2026-07-09

OpenAI's generally available balanced GPT-5.6 model, positioned below Sol. API list for short context, checked 23 Sep 2026, is $2 / $12 per 1M tokens.

Balanced GPT-5.6 tier for daily coding, research, and agent workflows when Sol's higher price is unnecessary.

Composite58
ContextUnlisted
Input / 1M$2.0
Output / 1M$12
Knowledge cutoffunpublished
Output speed122 t/s
Statussolid

Family profile

Best published score in each covered benchmark family.

75/100 avg
Knowledge
47
Reasoning
93
Coding
55
Agentic
88
Multimodal
81
Long context
83

6 tested benchmark families

Editor's note
Terra moved from limited preview to general availability on July 9, 2026. Independent benchmark rows now cover the family, while OpenAI still has not published the context limit.
Benchmark placements

Where GPT-5.6 Terra places on each public benchmark source that publishes a row. Rank counts every model with a latest row in the same test — not a universal quality score.

BenchmarkFamilyRankScoreSourceDate
CritPtReasoning#3/ 1230Artificial Analysis — CritPt2026-09-01
Terminal-Bench-ScienceAgentic#5/ 99Terminal-Bench-Science 0.1 announcement2026-08-27
MMMU-ProMultimodal#7/ 881Artificial Analysis — MMMU-Pro2026-09-01
Terminal-BenchAgentic#8/ 16788Artificial Analysis2026-09-28
AA-OmniscienceKnowledge#12/ 1247Artificial Analysis — AA-Omniscience2026-09-01
AA-LCRLong context#14/ 18483Artificial Analysis2026-09-28
GPQA DiamondReasoning#23/ 18493Artificial Analysis2026-09-28
SciCodeCoding#23/ 9755Artificial Analysis2026-09-28
Humanity's Last ExamReasoning#26/ 18643Artificial Analysis2026-09-28
AA output speedPerformance#44/ 195Artificial Analysis2026-10-12
Family context

The three highest-scoring models with pages in each capability family. Where GPT-5.6 Terra shows up, it's highlighted.

ReasoningGPT-5.6 Terra · 93
  1. 1
    GPT-6 Astra
    96
  2. 2
    Claude Mythos Preview
    95
  3. 3
    Gemini 3.7 Flash
    95
Long contextGPT-5.6 Terra · 83
  1. 1
    Kimi K3
    89
  2. 2
    MiMo-V2.6-Pro
    86
  3. 3
    Claude Fable 5.1
    85
Newest receipts

Benchmark rows added to the public ledger for GPT-5.6 Terra in the last 120 days. Older rows live in the full table below.

10 recent
BenchmarkFamilyScoreSourceDays ago
AA output speedPerformance122 t/sArtificial Analysis10
AA-LCRLong context83%Artificial Analysis24
GPQA DiamondReasoning92.5%Artificial Analysis24
Humanity's Last ExamReasoning42.9%Artificial Analysis24
SciCodeCoding55%Artificial Analysis24
Terminal-BenchAgentic88.01%Artificial Analysis24
CritPtReasoning30%Artificial Analysis — CritPt51
AA-OmniscienceKnowledge46.8%Artificial Analysis — AA-Omniscience51
MMMU-ProMultimodal80.7%Artificial Analysis — MMMU-Pro51
Terminal-Bench-ScienceAgentic8.6%Terminal-Bench-Science 0.1 announcement56
Family coverage

A high composite that hides a weak family is a trap. These bars surface the families where this model hasn't been publicly tested, and where it leads.

Knowledge47
Reasoning93
Coding55
Agentic88
Multimodal81
Long context83
Price vs. performance
0255075100$0.10$0.30$1$3$10$30input USD / 1M tokens · log scale →← intelligence

Hover any dot for name, score, and input price. Keyboard: tab through the top twelve, or use the ranking below.

AnthropicOpenAIGoogleAlibabaMetaZhipuxAIDeepSeekMiniMaxXiaomiMoonshotOtherMeituanMistralNVIDIACohere

Full benchmark ledger

Every catalog benchmark for GPT-5.6 Terra. Scores link to the original source; gaps mean no public row exists yet.

10 sourced rows

10 of 13 catalog benchmarks have a sourced row for GPT-5.6 Terra.

Knowledge

Reasoning

Coding

Agentic

Multimodal

Long context

Performance

Changelog
  1. API list re-checked. Standard for short context is $2 input and $12 output per 1M tokens.
  2. Recorded general availability across ChatGPT, Codex, and the API and refreshed benchmark evidence.
  3. Updated public pricing: Terra is listed at $2.50 input / $15 output per 1M tokens.
  4. Previewed as the balanced GPT-5.6 tier.
Sources

Questions this model page answers

Every answer below is assembled from the dated fields on this page. Nothing is written separately for search.

What is GPT-5.6 Terra?

GPT-5.6 Terra is a OpenAI model: OpenAI's generally available balanced GPT-5.6 model, positioned below Sol. API list for short context, checked 23 Sep 2026, is $2 / $12 per 1M tokens.

What is GPT-5.6 Terra for?

Balanced GPT-5.6 tier for daily coding, research, and agent workflows when Sol's higher price is unnecessary.

What does GPT-5.6 Terra cost?

GPT-5.6 Terra lists $2.0 input and $12 output per 1M tokens. Pricing last checked 2026-09-23.

How large is the GPT-5.6 Terra context window?

GPT-5.6 Terra does not publish a context window on the sources checked for this page.

What is the VerdictPal status of GPT-5.6 Terra?

GPT-5.6 Terra carries Solid status on the model atlas.

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